don't allow user entry with uidnumber=0

Hello all,
Is it possible to have the ldap to not allow users entries with uidnumber=0?
If I add an entry to ldap and have uidnumber=0 then I am root to the system!!
Regards,
PAvlos
--
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I love having the feeling of being in control
while i have the sensation of speed
The surfer of life
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GnuPG Key: FB1E6AE7
Fingerprint A9AE EA0C EE1F FBD0 5B6F 3F77 2782 EFE2 FB1E 6AE7
Get my key here: http://users.hol.gr/~p_pavlos/pubpgpkey.txt